Intended port rotation: Chinese main ports to Luanda. Other ports are also welcome but subject to inducement.

计划挂港顺序：中国主要港口至罗安达，其他港口取决于货量。

To calculate discharge port pressure, this article considers the influence on frictional pressure drop in the gas and liquid two-phase flow between rod and tubing owing to rotation of rods.

在计算排出口压力计算过程中，考虑了由于抽油杆柱旋转引起杆管环空气液两相流摩阻的影响。

Compression process: with the rotor rotation, compression chamber volume decreases, the gas compressed with the compression chamber until the exhaust port to the forefront.

压缩过程：随着转子旋转，压缩腔容积不断减小，气体随压缩直至压缩腔前沿转至排气口。